White Dwarf and Neutron Star

The White dwarf is a very dense; it has close to the same mass to a Sun, and is comparable to the Earth, they are both very dense.

The white Dwarf is also called degenerate dwarf, is a small star composed mostly of electron matter.

In1910 by Henry Norris Russell, Edward Charles Pickering and Williamina Fleming; discovied the White Dwarf and they had named it in the year 1922.

When stars stop burning they shrink and become very small but still dense, when this happens it is now a White Dwarf , and dosent matter about there colour it is still a White Dwarf, you can notice this when it gets lower then 1.4 solar masse.




PICTURES

http://www.nasa.gov/centers/goddard/images/content/207358main_whitedwarf_20080102_HI1.jpg
http://www.nasa.gov/images/content/149756main_image_feature_584_ys_4.jpg
http://www-tc.pbs.org/wgbh/nova/gamma/images/cosm_whitedwarf_large.jpg?Log=0
http://science.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Science/Images/Content/white-dwarf-spiral-wd-03-ga.jpg




Neutron stars are a compact object that are created in the cores of big stars during the big supernova explosions.

The core of the star collapses and crushes together every proton with a corresponding electron turning each into a neutron.

But if this does not happen it will most likely stay a Neutron star. Like the White Dwarf they are very dense.

Neutron stars can be observed by being on a X-ray binary and a pulsar. About 5% of the Neutron stars are Binary.

A normal or average Neutron star you will hear bout or see will be around 1.35 - 2.1 solar masses, and with radius between or average of 20 and 10 km, and the Sun being 30,000 - 70,000 times bigger.

PICTURES

http://chandra.harvard.edu/photo/2002/0052/0052_xray_widefield.jpg
http://www.science.psu.edu/alert/images/FoxNeutronArtwork.jpg
http://www.nrao.edu/pr/2004/sn1986j/sn1986j.artist.jpg
http://space.newscientist.com/data/images/ns/cms/dn9428/dn9428-1_620.jpg